Seated abdominal exerciser

Abstract

An abdominal exerciser in which the body floats with respect to the exerciser frame, which leads to isolating the abdominal muscles. The exerciser includes a seat; a frame adapted to support said seat in a position that is raised off a floor; a seat pivot connecting said seat and frame, said pivot located under said seat; an upper body arm adapted to engage the upper body of a user; an upper body arm pivot connecting said seat and said upper body arm; and a lower body arm attached to said seat.

1. An exerciser comprising:
 a seat; 
 a frame adapted to support said seat in a position that is raised off a floor; 
 a seat pivot pivotably connecting said seat and frame, said pivot located under said seat; 
 an upper body arm adapted to engage the upper body of a user; 
 an upper body arm pivot pivotably connecting said seat and said upper body arm; 
 a lower body arm adapted to engage the lower body of a user, said lower body arm attached to said seat, wherein when said upper body arm is oriented in front of said user, a pushing force, applied to said upper body arm, causes an end of said seat to pivot downward, wherein said end of said seat that pivots downwards is the end furthest from the lower body arm; and 
 a leverage bar attached beneath said seat to said upper body arm and a constraint mechanism adapted to constrain movement of said leverage bar with respect to said frame in at least one direction while not constraining movement in another direction; wherein said constraint mechanism comprises a first roller and a second roller, and said leverage bar is movably trapped between said first roller and said second roller. 
 
   
   
     2. An exerciser as in  claim 1 , and further including an adjustment mechanism for positioning said leverage bar and said upper body arm for adjustment. 
   
   
     3. An exerciser as in  claim 1  wherein said constraint mechanism is attached to said frame. 
   
   
     4. An exerciser as in  claim 1  wherein said seat pivot is attached to the middle of the underside of said seat. 
   
   
     5. An exerciser as in  claim 1  wherein said upper body pivot is connected to the underside of said seat. 
   
   
     6. An exerciser as in  claim 1  wherein said upper body pivot is connected to the back of said seat. 
   
   
     7. An exerciser as in  claim 1 , and further including a back support attached to said frame. 
   
   
     8. An exerciser as in  claim 1  wherein said downward pivoting movement of the seat in response to said pushing force applied to said upper body arm results from the orientation of the seat pivot and upper body arm pivot in respect to said seat. 
   
   
     9. An exerciser as in  claim 1 , further comprising a back support attached to said frame at a back support pivot point. 
   
   
     10. An exerciser as in  claim 1 , further comprising a moving leverage point that provides resistance to said upper body arm but does not constrain the range of motion of said upper body arm. 
   
   
     11. An exerciser comprising:
 a seat; 
 a frame adapted to support said seat in a position above a floor; 
 a seat pivot pivotably connecting said seat and frame, said pivot located under said seat; 
 an upper body arm adapted to engage the upper body of a user; 
 an upper body arm pivot pivotably connecting said seat and said upper body arm; 
 a lower body arm adapted to engage the lower body of a user, said lower body arm attached to said seat; 
 a moving leverage point that engages said upper body arm but allows said upper body arm to rotate in the upper body arm pivot; and 
 a leverage bar attached to said upper body arm and a constraint mechanism adapted to constrain movement of said leverage bar with respect to said frame in at least one direction while not constraining movement in another direction; wherein said constraint mechanism comprises a first roller and a second roller, and said leverage bar is movably trapped between said first roller and said second roller. 
 
   
   
     12. An exerciser comprising:
 a pivoting seat; 
 a seat bracket, attached to and directly under the pivoting seat; 
 a first pivot point in the seat bracket, the first pivot point directly under the pivoting seat; 
 a pivot bar, attached through the first pivot point; 
 a first leg having a first leg cylinder, the first leg cylinder attached on the pivot bar; 
 a second leg having a second and third leg cylinder, the second and third leg cylinder attached on the pivot bar; 
 a left and right arm forming an arms/leverage bar; 
 support frame which includes the first and second leg, which holds the pivoting seat and provides a leverage point for the arms/leverage bar; 
 a leg raise assembly, including a lower body arm, fastened to the pivoting seat; 
 an upper body arm/leverage bar assembly including the arms/leverage bar that fastens to the pivoting seat at a second pivot point in the seat bracket under the pivoting seat; 
 an adjustment assembly for adjustment of the arms/leverage bar to provide for different body sizes; 
 a back support, wherein the upper body arm is adapted to engage the upper body of the user and a lower body arm is a structure adapted to engage the lower body of the user; and 
 a moving leverage point, including a roller constraint mechanism which include a first and second roller. 
 
   
   
     13. The exerciser of  claim 1  wherein the first and second roller are in direct contact with the leverage bar. 
   
   
     14. The exerciser of  claim 1  wherein the upper body arm is pivotally connected directly under the seat. 
   
   
     15. The exerciser of  claim 1  wherein the leverage bar is pivotally connected directly under the seat. 
   
   
     16. The exerciser of  claim 1  wherein the upper body arm and the leverage bar are pivotally connected directly under the seat at the same pivot point. 
   
   
     17. The exerciser of  claim 1  wherein the first roller and the second roller are connected to the frame using a first pin and a second pin. 
   
   
     18. The exerciser of  claim 1 , further comprising an adjustment assembly interconnected with the upper body arm and the leverage bar, wherein the adjustment assembly controls the angle between the upper body arm and the leverage bar. 
   
   
     19. The exerciser of  claim 18  wherein the adjustment assembly includes a first bracket having first adjustment holes, a second bracket having a second adjustment hole, and an adjustment knob having a pin that passes through one of the first adjustment holes into the second adjustment hole.